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İstanbul Teknik Üniversitesi (2012)

Low Flow Analysis Of Iran’s Karun Upper Basin

MAHNAMFAR Farrokh

Titre : Low Flow Analysis Of Iran’s Karun Upper Basin

İran’ın Karun Üst Havzasındaki Düşük Akımların Analizi

Auteur : MAHNAMFAR Farrokh

Université de soutenance : İstanbul Teknik Üniversitesi

Grade : Master of Science (MS) 2012

Résumé
In this study, iran’s karun upper basin, at least 15 years of recording time and not affected by dams, daily value stations were used. Furthermore, all selected stations have daily missing data and only 21-233 station has 2 years value missing data. As a result, 12 stations were selected. In this study, 21-215 ,21-223, 21-225, 21-231, 21-233, 21-497 stations were completed by linear regression for daily flow values and low flow values (7 day minimum flow) were calculated. Duration curves on the daily flow values (flow duration curve, flow frequency in year) were obtained. Flow duration curve based on the observed data shows the flow rate exceeded a certain percentage of the time in streams. Here, 21-205 station as an example, flow duration curves were obtained using daily values for 39 years (14245 daily values). Flow frequency in year was obtained for 7 day minimum values. Return period was found for each year and this value punctuated with 7 day minimum values. Passing a line through these points, flow frequency in year was obtained. Each station for various return periods, low flow value to was estimated by two-parameter (Lognormal, Weibull, Exponential) and three-parameter (Lognormal, Weibull, Pearson type III, Logpearson type III, generalized extreme value, generalized logistic) distributions. By applying Kolmogorov-Smirnov test and probability plot correlation coefficient test (PPCC) for stations’ data, the most appropriate distribution was chosen. Low flows were estimated for various return periods. Mann-Kendall trend analysis was performed to investigate the increasement or decreasement of data by time. As a result, knowledge obtained about Karun basin low flows analysis can be used for current structures management and water resource activities in basin.

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